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Capital Ratios (Details) $ in Thousands | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jan. 01, 2019 | Dec. 31, 2018 USD ($)
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Capital ratios |  |  |  |  |  |  |  |  |  |
Capital conversion buffer common equity Tier 1 of risk-weighted assets (as a percent) |  |  |  |  |  |  |  |  | 2.50% |
Additional allowance for credit losses for loans |  | $ 440,159 | $ 434,608 |  |  | $ 56,927 | $ 60,255 | $ 58,213 |  | $ 55,798
Deferred tax assets |  | 107,500 |  |  |  | 31,316 | 27,844 |  |  |
Additional reserve for unfunded commitments |  | 43,200 |  |  |  |  |  |  |  |
Retained earnings |  | $ 604,564 |  |  |  | $ 679,895 | $ 646,325 |  |  |
Tier One Risk Based Capital to Risk Weighted Assets |  | 11.48 |  |  |  | 12.25 | 12.19 |  |  |
Capital to Risk Weighted Assets (as a percent) |  | 13.86 |  |  |  | 12.78 | 12.71 |  |  |
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets (as a percent) |  | 8.00 |  |  |  | 8.00 | 8.00 |  |  |
Common equity Tier 1 to risk-weighted assets |  |  |  |  |  |  |  |  |  |
Actual, Capital Amount |  | $ 2,940,041 |  |  |  | $ 1,326,725 | $ 1,302,034 |  |  |
Actual, Ratio (as a percent) |  | 11.48% |  |  |  | 11.30% | 11.22% |  |  |
Minimum capital required, Ratio (as a percent) |  | 4.50% |  |  |  |  |  |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 1,664,927 |  |  |  | $ 763,495 | $ 754,257 |  |  |
Required to be considered well capitalized, Ratio (as a percent) |  | 6.50% |  |  |  | 6.50% | 6.50% |  |  |
Tier I capital to risk-weighted assets |  |  |  |  |  |  |  |  |  |
Actual, Capital Amount |  | $ 2,940,041 |  |  |  | $ 1,438,995 | $ 1,414,138 |  |  |
Actual, Ratio (as a percent) |  | 11.48 |  |  |  | 12.25 | 12.19 |  |  |
Minimum capital required, Ratio (as a percent) |  | 4 |  |  |  | 6 |  |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 2,049,141 |  |  |  | $ 939,686 | $ 928,316 |  |  |
Required to be considered well capitalized, Ratio (as a percent) |  | 8.00 |  |  |  | 8.00 | 8.00 |  |  |
Total capital to risk-weighted assets |  |  |  |  |  |  |  |  |  |
Actual, Capital Amount |  | $ 3,550,019 |  |  |  | $ 1,501,321 | $ 1,474,728 |  |  |
Actual, Ratio (as a percent) |  | 13.86 |  |  |  | 12.78 | 12.71 |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 2,561,427 |  |  |  | $ 1,174,607 | $ 1,160,395 |  |  |
Required to be considered well capitalized, Ratio (as a percent) |  | 10.00 |  |  |  | 10.00 | 10.00 |  |  |
Tier I capital to average assets (leverage ratio) |  |  |  |  |  |  |  |  |  |
Actual, Capital Amount |  | $ 2,940,041 |  |  |  | $ 1,438,995 | $ 1,414,138 |  |  |
Actual, Ratio (as a percent) |  | 8.12 |  |  |  | 9.73 | 9.72 |  |  |
Minimum capital required, Ratio (as a percent) |  | 8 |  |  |  |  |  |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 1,809,663 |  |  |  | $ 739,664 | $ 727,232 |  |  |
Required to be considered well capitalized, Ratio (as a percent) |  | 5.00 |  |  |  | 5.00 | 5.00 |  |  |
ASU 2016-13 |  |  |  |  |  |  |  |  |  |
Capital ratios |  |  |  |  |  |  |  |  |  |
Additional allowance for credit losses for loans | [1] |  |  | $ 54,438 |  |  |  |  |  |
Deferred tax assets | [2] |  |  | 12,639 |  |  |  |  |  |
Additional reserve for unfunded commitments |  |  |  | 6,400 |  |  |  |  |  |
Retained earnings |  |  |  | $ (44,820) | [3] | $ 44,800 |  |  |  |
ASU 2016-13 | Cumulative Effect of Adoption of ASU |  |  |  |  |  |  |  |  |  |
Capital ratios |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  | 44,800 |  |  |  |
Fully Phased-In |  |  |  |  |  |  |  |  |  |
Common equity Tier 1 to risk-weighted assets |  |  |  |  |  |  |  |  |  |
Minimum capital required, Capital Amount |  | $ 1,792,999 |  |  |  | $ 822,225 | $ 812,276 |  |  |
Minimum capital required, Ratio (as a percent) |  | 7.00% |  |  |  | 7.00% | 7.00% |  |  |
Tier I capital to risk-weighted assets |  |  |  |  |  |  |  |  |  |
Minimum capital required, Capital Amount |  | $ 2,177,213 |  |  |  | $ 998,416 | $ 986,336 |  |  |
Minimum capital required, Ratio (as a percent) |  | 8.50 |  |  |  | 8.50 | 8.50 |  |  |
Total capital to risk-weighted assets |  |  |  |  |  |  |  |  |  |
Minimum capital required, Capital Amount |  | $ 2,689,498 |  |  |  | $ 1,233,338 | $ 1,218,415 |  |  |
Minimum capital required, Ratio (as a percent) |  | 10.50 |  |  |  | 10.50 | 10.50 |  |  |
Tier I capital to average assets (leverage ratio) |  |  |  |  |  |  |  |  |  |
Minimum capital required, Capital Amount |  | $ 1,447,730 |  |  |  | $ 591,731 | $ 581,786 |  |  |
Minimum capital required, Ratio (as a percent) |  | 4.00 |  |  |  | 4.00 | 4.00 |  |  |
South State Bank (the Bank) |  |  |  |  |  |  |  |  |  |
Capital ratios |  |  |  |  |  |  |  |  |  |
Tier One Risk Based Capital to Risk Weighted Assets |  | 11.95 |  |  |  | 12.07 | 12.00 |  |  |
Capital to Risk Weighted Assets (as a percent) |  | 12.80 |  |  |  | 12.60 | 12.52 |  |  |
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets (as a percent) |  | 8.00 |  |  |  | 8.00 | 8.00 |  |  |
Common equity Tier 1 to risk-weighted assets |  |  |  |  |  |  |  |  |  |
Actual, Capital Amount |  | $ 3,052,492 |  |  |  | $ 1,417,616 | $ 1,392,599 |  |  |
Actual, Ratio (as a percent) |  | 11.95% |  |  |  | 12.07% | 12.00% |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 1,660,445 |  |  |  | $ 763,488 | $ 754,263 |  |  |
Required to be considered well capitalized, Ratio (as a percent) |  | 6.50% |  |  |  | 6.50% | 6.50% |  |  |
Tier I capital to risk-weighted assets |  |  |  |  |  |  |  |  |  |
Actual, Capital Amount |  | $ 3,052,492 |  |  |  | $ 1,417,616 | $ 1,392,599 |  |  |
Actual, Ratio (as a percent) |  | 11.95 |  |  |  | 12.07 | 12.00 |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 2,043,625 |  |  |  | $ 939,677 | $ 928,324 |  |  |
Required to be considered well capitalized, Ratio (as a percent) |  | 8.00 |  |  |  | 8.00 | 8.00 |  |  |
Total capital to risk-weighted assets |  |  |  |  |  |  |  |  |  |
Actual, Capital Amount |  | $ 3,270,970 |  |  |  | $ 1,479,942 | $ 1,453,189 |  |  |
Actual, Ratio (as a percent) |  | 12.80 |  |  |  | 12.60 | 12.52 |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 2,554,531 |  |  |  | $ 1,174,597 | $ 1,160,405 |  |  |
Required to be considered well capitalized, Ratio (as a percent) |  | 10.00 |  |  |  | 10.00 | 10.00 |  |  |
Tier I capital to average assets (leverage ratio) |  |  |  |  |  |  |  |  |  |
Actual, Capital Amount |  | $ 3,052,492 |  |  |  | $ 1,417,616 | $ 1,392,599 |  |  |
Actual, Ratio (as a percent) |  | 8.46 |  |  |  | 9.59 | 9.58 |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 1,803,670 |  |  |  | $ 739,490 | $ 727,060 |  |  |
Required to be considered well capitalized, Ratio (as a percent) |  | 5.00 |  |  |  | 5.00 | 5.00 |  |  |
South State Bank (the Bank) | Fully Phased-In |  |  |  |  |  |  |  |  |  |
Common equity Tier 1 to risk-weighted assets |  |  |  |  |  |  |  |  |  |
Minimum capital required, Capital Amount |  | $ 1,788,172 |  |  |  | $ 822,218 | $ 812,284 |  |  |
Minimum capital required, Ratio (as a percent) |  | 7.00% |  |  |  | 7.00% | 7.00% |  |  |
Tier I capital to risk-weighted assets |  |  |  |  |  |  |  |  |  |
Minimum capital required, Capital Amount |  | $ 2,171,352 |  |  |  | $ 998,407 | $ 986,345 |  |  |
Minimum capital required, Ratio (as a percent) |  | 8.50 |  |  |  | 8.50 | 8.50 |  |  |
Total capital to risk-weighted assets |  |  |  |  |  |  |  |  |  |
Minimum capital required, Capital Amount |  | $ 2,682,258 |  |  |  | $ 1,233,327 | $ 1,218,426 |  |  |
Minimum capital required, Ratio (as a percent) |  | 10.50 |  |  |  | 10.50 | 10.50 |  |  |
Tier I capital to average assets (leverage ratio) |  |  |  |  |  |  |  |  |  |
Minimum capital required, Capital Amount |  | $ 1,442,936 |  |  |  | $ 591,592 | $ 581,648 |  |  |
Minimum capital required, Ratio (as a percent) |  | 4.00 |  |  |  | 4.00 | 4.00 |  |  |
[1] | This is the calculated adjustment to the ACL related to the adoption of ASC 326. Additional reserve related to non-acquired loans was $34,049, to acquired loans was $16,981 and to purchased credit deteriorated loans was $3,408.
[2] | This is the effect of deferred tax assets related to the adjustment to the ACL from the adoption of ASC 326 using a 22% tax rate.
[3] | This is the net adjustment to retained earnings related to the adoption of ASC 326.

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